What are the IASP diagnostic criteria for complex regional pain syndrome I (CRPS I)?

The most widely accepted criteria for the diagnosis were published by the International Association for the Study of Pain (IASP). It lists the diagnostic criteria for complex regional pain syndrome I (CRPS I) (RSDS) as follows
[21] :
[22]

The presence of an initiating noxious event or a cause of immobilization

Continuing pain, allodynia (perception of pain from a nonpainful stimulus), or hyperalgesia disproportionate to the inciting event

Evidence at some time of edema, changes in skin blood flow, or abnormal sudomotor activity in the area of pain

The diagnosis is excluded by the existence of any condition that would otherwise account for the degree of pain and dysfunction.

According to the IASP, CRPS II (also known as causalgia) is diagnosed as follows:

The presence of continuing pain, allodynia, or hyperalgesia after a nerve injury, not necessarily limited to the distribution of the injured nerve

Evidence at some time of edema, changes in skin blood flow, or abnormal sudomotor activity in the region of pain

The diagnosis is excluded by the existence of any condition that would otherwise account for the degree of pain and dysfunction.